and the shape parameter \(\Gamma \) , is given by [1]}, [2]}
\(\Gamma \equiv \mathrm {\Omega _{M,0}}h\left(\zeta +\frac{1-\zeta }{[1+0.43\mathrm {k}r_{s}(z_{d})]^{4}}\right),\,\,\upsilon =\mathrm {\frac{\Omega _{b,0}}{\Omega _{M,0}}},\quad \\\zeta =1-0.328\ln (431\mathrm {\Omega _{M,0}}h^{2})\upsilon +0.38\ln (22.3\mathrm {\Omega _{M,0}}h^{2})\upsilon ^{2}.\nonumber \) 
